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Resistance testers — also known as ohmmeters — are essential tools for verifying electrical safety and system reliability. From insulation resistance testers (megohmmeters) that measure extremely high resistances to low resistance ohmmeters (micro-ohmmeters) designed for precise low-ohm measurements, these instruments cover the full spectrum of resistance testing needs.
Megger MIT525 insulation resistance tester applying DC test voltages to 5 kV for evaluation of electrical insulation in cables, motors, transformers, and switchgear. Supports IR, timed IR, DAR, PI, dielectric discharge, stepped voltage, and ramp tests with onboard memory and USB data transfer.
Megger MOM3 handheld micro-ohmmeter rated up to 300 A for low-resistance measurement. Auto range covers 0.1 µΩ to 3000 mΩ with selectable 5–300 A test current. Battery-operated IP54 instrument with USB-C PC communication and pass/fail threshold setting.
The Fluke 1587T Insulation Multimeter combines a digital insulation tester with a true-rms digital multimeter in one handheld instrument. Designed for telecom applications, it provides 50 V and 100 V insulation test voltages along with AC/DC voltage, millivolt, milliamp, resistance, and continuity measurements.
The Megger MJÖLNER 200 is a portable micro-ohmmeter high current system integrated into a rugged hard case with on-board display and controls. The front panel provides DC+ and COM terminals, dedicated sense inputs, shunt output, current clamp input, and labeled interface ports for field testing configurations.
Fluke 1535 Insulation Resistance Tester delivers 250V–2500V testing with insulation measurements up to 500 GΩ. Designed for industrial and solar environments with CAT IV 600V safety and automatic PI/DAR calculations.
Fluke 1555 FC KIT insulation resistance tester delivers digital testing up to 10 kV with IR3000FC wireless connectivity, onboard data storage, and advanced diagnostic measurements for high-voltage electrical assets.
Fluke 1550C KIT Insulation Resistance Tester delivers up to 5 kV testing with adjustable test voltages: 50 V increments up to 1000 V and 100 V steps for test voltages over 1,000. Includes DAR results, rugged IP67 case, and long battery life for field use.
Fluke 1550C Insulation Resistance Tester delivers digital insulation testing up to 5 kV with DAR/PI calculations, long battery life, and Fluke Connect support.
AEMC C.A 6240 digital micro-ohmmeter for precise low-resistance and contact resistance testing. 4-wire Kelvin measurement with selectable test currents up to 10A, 1 µΩ resolution, onboard memory, and DataView® software support.
Fluke 1555 FC insulation tester delivers up to 10 kV testing with data storage, leakage current measurement, and enhanced CAT IV safety.
Fluke 1555 FC insulation tester delivers up to 10 kV testing with Fluke Connect remote operation, PI/DAR calculations, and CAT IV safety ratings.
Certified pre-owned Megger MIT1025: 10 kV insulation resistance tester designed for high-voltage equipment diagnostics. It delivers fast, stable readings up to 20 TΩ, supports PI/DAR testing, and includes advanced filtering for noisy environments—ideal for substations, motors, cables, and transformers.
Fluke 1503 insulation tester delivers reliable 500V/1000V resistance testing up to 2 GΩ with live circuit detection, continuity testing, and user-safe auto-discharge.
Fluke 1587 MDT FC kit combines insulation testing, True-RMS multimeter functions, AC current measurement, and phase rotation checks for advanced motor diagnostics.
Fluke 1507 insulation tester delivers advanced megohm measurements, multiple test voltages, PI/DAR calculations, and safety features for industrial electricians.
The Amprobe MO-100 Milliohm Meter offers accurate four-terminal resistance measurement with auto-hold, overvoltage protection, and a portable battery-powered design.
Fluke 1503/EX LEAD insulation tester kit with 50ft lead and remote probe for fast, safe insulation resistance testing up to 2000MΩ at 500V or 1000V.
The Fluke 1587KIT/62MAX+ pairs a 1000 V insulation multimeter with a precision infrared thermometer for comprehensive electrical maintenance and insulation testing. Ideal for diagnosing motor windings, transformers, switchgear, and high-voltage circuits.
The Fluke 1555/KIT is a premium insulation resistance tester kit offering up to 10 kV test voltage, wireless connectivity, and advanced measurement functions (DAR, PI). Designed for use in switchgear, motors, cables, and generators.
Fluke 1577 combines insulation testing and true-RMS multimeter features for motors, generators, cables, and switchgear troubleshooting.
FThe Fluke 1507 is a compact, rugged insulation resistance tester offering selectable test voltages from 50 V to 1000 V, automatic Polarization Index (PI) and Dielectric Absorption Ratio (DAR) calculations, and CAT IV 600 V overvoltage rating — designed for contractors, industrial maintenance, and commissioning environments.
Fluke 1587 FC Multimeter: Wireless insulation testing with live circuit detection, data logging, and app-based remote monitoring.
AEMC BR07 Resistance Decade Box offers 1% precision, a 1Ω–10MΩ range, rotary switches, and safety terminals—ideal for calibration and test equipment verification.
10A low-resistance tester with instantaneous, continuous, and automatic test modes for precise plant and field measurements.
AEMC 6292 Micro-Ohmmeter: Portable low-resistance tester with 200A current, precise measurement, and DataView software for efficient reporting.
Resistance testers and ohmmeters play a vital role in electrical maintenance, troubleshooting, and compliance testing. By accurately measuring resistance across cables, windings, and connections, they help technicians identify weaknesses before they lead to failures, downtime, or safety hazards. Our lineup includes two primary categories:
These instruments apply high DC test voltages to measure very high resistance values, often in the megohm to teraohm range. As specialized ohmmeters, they are used to verify the integrity of insulation in cables, transformers, and motors, ensuring systems remain safe and dependable.
These testers use high test currents and four-wire measurement techniques to capture very low resistance values down to micro-ohms. Also referred to as low-resistance ohmmeters, they are essential for checking the quality of breaker contacts, busbar joints, welds, and grounding bonds where reliable, low-resistance connections are critical.
Together, these resistance testers and ohmmeters provide complete coverage for both high-resistance and low-resistance applications, making them indispensable tools for utilities, industrial plants, and field service technicians.